Hey! Are there any options for this one?
If not:
All electromagnetic waves can travel through space. This is how we get heat from the sun, light from the sun, and light from other planets. Electromagnetic waves also have the same speed in a vacuum. Space is a vacuum of sorts, since there isn't any air, and all electromagnetic waves travel at the speed of light. However they may slow down when they pass through a medium. A medium is like water, gases, solids, etc.
:D